该文章题为Cytokinin activity increases stomatal density and transpiration rate in tomato ，发表时间较早，科学家利用植物生理组学测量系统研究发现细胞分裂素活力增加西红柿气孔密度和蒸腾速率。

Cytokinin activity increases stomatal density and transpiration rate in tomato 

Mika Farber, Ziv Attia, David Weiss 

Author Notes

Journal of Experimental Botany, Volume 67, Issue 22, 1 December 2016, Pages 6351–6362, https://doi.org/10.1093/jxb/erw398

Abstract

Previous studies on cytokinin (CK) and drought have suggested that the hormone has positive and negative effects on plant adaptation to restrictive conditions. This study examined the effect of CK on transpiration, stomatal activity, and response to drought in tomato (Solanum lycopersicum) plants. Transgenic tomato plants overexpressing the Arabidopsis thaliana CK-degrading enzyme CK oxidase/dehydrogenase 3 (CKX3) maintained higher leaf water status under drought conditions due to reduced whole-plant transpiration. The reduced transpiration could be attributed to smaller leaf area and reduced stomatal density. CKX3-overexpressing plants contained fewer and larger pavement cells and fewer stomata per leaf area than wild-type plants. In addition, wild-type leaves treated with CK exhibited enhanced transpiration and had more pavement cells and increased numbers of stomata per leaf area than untreated leaves. Manipulation of CK levels did not affect stomatal movement or abscisic acid-induced stomatal closure. Moreover, we found no correlation between stomatal aperture and the activity of the CK-induced promoter Two-Component Signaling Sensor (TCS) in guard cells. Previous studies have shown that drought reduces CK levels, and we propose this to be a mechanism of adaptation to water deficiency: the reduced CK levels suppress growth and reduce stomatal density, both of which reduce transpiration, thereby increasing tolerance to prolonged drought conditions.

Cytokinin activity increases stomatal density and transpiration rate in tomato

Farber et. Al., (2016) Journal of Experimental Botany DOI: 10.1093/jxb/erw398